Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a84f2d249a05746…

MALICIOUS

PDF

62.5 KB Created: 2021-09-04 21:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: c8ae6f37912a8a6f160b5a5d899b4952 SHA-1: 2bd4c1764986331107ce96240ca258a80939fa18 SHA-256: 5a84f2d249a05746e2d25e7f15bd21169ea60dc3cc7a3a3a0bda71e76855e962
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm, with many URLs pointing to potentially compromised websites or disposable hosting. The presence of embedded URLs suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6973

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=culture+of+fungi+pdf PDF link annotation
    • http://hangquangauto.com/files/tozodulupupa.pdfIn PDF document text
    • https://guijek.com/userfiles/file/novoxasitiv.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/12690683370.pdfIn PDF document text
    • http://ned.ru/uploads/files/xodefijeresubozif.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/2cecd0b60b4d585ca2a47212fe252621/28263700938.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/74108639318.pdfIn PDF document text
    • http://www.umadai.com/ckfinder/userfiles/files/pabeluwisutatovuga.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/c4be0bd4bc215a2220062e888d30d7f7/21982432072.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/9601630807.pdfIn PDF document text
    • http://unipsyclinic.com/userfiles/file/20210801012158.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/8abfd6f96e3f5c3da8ba8185f0c13a3f/7592201715.pdfIn PDF document text
    • http://daiichilogistics.com/uploads/news_file/65786882469.pdfIn PDF document text
    • http://eurekaelearning.com/upload/news/file/letikabolilebedegate.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ece654807---37692278379.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/femojubokiwi.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffbed021b2---vumixosefotilop.pdfIn PDF document text
    • http://leinerpakgelatine.com/survey/userfiles/files/52484139753.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/vv91ifu7kbjo5viqd2q63s5oo6/69606434508.pdfIn PDF document text
    • https://cissud.eu/uploads/ck_editor/files/90546842213.pdfIn PDF document text
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/9f61e3623158d54365ec1f4c86457e18/kutedinepapemutagopujuso.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16090d1dd85cdf---81093824088.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/e6af943890047747d17707696ec67c4f/tujuvuromigajugizuxiv.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/10078006280.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/e3d70658e8a9698433b8d8ba342010f8/36315388074.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000caba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCABA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e2d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D1 10472 bytes
SHA-256: 2c063c1ca829f639c20382b7edcd651fdca95c85554f48f31031af2175de2989